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YICS tool - insert and forget?

Discussion in 'XJ Technical Chat' started by bbacher, May 13, 2008.

  1. bbacher

    bbacher Member

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    I used the search option but couldn't find what I was looking for.

    I read a YICS tool discussion a while back where someone suggested inserting the YICS tool, leaving it there, and "ride forever".

    What I want to know: is that really a good idea?

    As I understand it, the YICS was invented as a way of increasing gas mileage without impacting performance. If that's true, then it seems keeping the tool inserted wouldn't hurt anything. And if it doesn't hurt anything, why not do as he suggested and leave it there?
     
    bbacher, May 13, 2008
    #1
  2. BlueMaxim

    BlueMaxim Active Member

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    Well of couse it can be done. It would eliminate the balance tube which is all a YICS port is. In time however one or more of the seals on the tool may start to leak. This would cause an imbalance on one or more carbs. If the end seal leaks it would cause a lean condition on either #1 or #4 cylinder which could lead to damage. That is why I wouldn't suggest it.
     
    BlueMaxim, May 13, 2008
    #2
  3. bbacher

    bbacher Member

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    bbacher, May 14, 2008
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  4. chacal

    chacal Moderator Moderator Supporting Vendor Premium Member

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    Regarding leaving the YICS tool for ANY extended period of time:

    Follow Nike's advice, JUST SAY NO!

    In fact, it's not a bad idea to withdraw the tool while you have the engine shut down in-between colortuning cylinders....whemever the engine gets shut down (to move the colortune plug from one cylinder to the next), remove the tool and allow it to cool, also.

    If those rubber seals ever melt, you've got a BIG mess on your hands.........
     
    chacal, May 14, 2008
    #4
  5. bbacher

    bbacher Member

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    Yep, I can imagine!
     
    bbacher, May 14, 2008
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  6. Toreadorranger

    Toreadorranger Member

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    How about JB welding the holes shut? or a high temp epoxy?
     
    Toreadorranger, Oct 31, 2008
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  7. chacal

    chacal Moderator Moderator Supporting Vendor Premium Member

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    Umm, not really recommended!!
     
    chacal, Oct 31, 2008
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  8. flash1259

    flash1259 Member

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    try a drumstick and break off whats hanging out

    "DON'T DO THIS" I was adding more stupidity to the topic.
     
    flash1259, Oct 31, 2008
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  9. spinalator

    spinalator Member

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    You kid are cuuhhrraaaazzzyy!
     
    spinalator, Oct 31, 2008
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  10. bigfitz52

    bigfitz52 Well-Known Member Premium Member

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    YICS is why your 550 (when properly tuned) will run circles around a lot of modern bikes, even ones of larger displacement. IT WORKS. With that motor, in that state of tune, it's necessary if you want full performance out of that little mill. Why mess with it? How many miles are on your bike, and have you adjusted your valve clearances yet? It will make an AMAZING difference in how the bike performs if it needs it.
     
    bigfitz52, Oct 31, 2008
    #10

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